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onDraw method of the PianoView for the SSaurel's Channel
protected void onDraw(Canvas canvas) {
for (Key k : whites) {
canvas.drawRect(k.rect, k.down ? yellow : white);
for (int i = 1; i < NB; i++) {
canvas.drawLine(i * keyWidth, 0, i * keyWidth, height, black);
for (Key k : blacks) {
canvas.drawRect(k.rect, k.down ? yellow : black);
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